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(No ModeL) 2 Sheets-Sheet l.

J,.A.GR0SH`0N.

COD/[POUND STEAM ENGINE.

No. 319,90. PatentedJune 9, 1885.A

' ATTRNBY (No Model.) 2 Sheets-*Sheet 2. J. A. GROSHON.

OMPOUND STEAM ENGINE.

No. 319,900. Patented June 9, 1885.

E I n PS WITNESSES INVENTOR WMW# rgb ATTORNEY ATENT written..

JOHN A. ornosn'oN,`

or NEW YORK, N. Y.

COMPOUND STEAM-ENGINE.

sPnCFICATION forming part of Letters Patent No. 319,900, dated .inne 9, 1885.

I Application filed November 10, i884. (No model.)

To a/ZZ whom it may concern,.-

Be it known that I, JOHN A. GRosHoN, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Compound Steamcylinder, whose piston has a larger area than that of the high-pressure cylinder, the effecti being that the steam will continue its pressure against the piston in the high-pressure cylin- -der and expand within and exert at the same time pressure against the piston in the expansive-cylinder, thus preserving a regularity of.` movement, the increased area in the expansive cylinder counteracting the effect of the decrease in the pressure in theinitial cylinder.

The present invention is to be distinguished from other engines having expansive cylinders in that heretofore the piston in the high'- pressure cylinder has beenallowed to make a -i'ull stroke under boiler-pressure before the steam was turned into the expansive cylinder. By means of my invention t-he consumption of fuel is reduced toa minimum amount, and the pressure on the pistons does not vary materially throughout their stroke. The invent-ion also admits ofthe use of a cut-oft' on a directacting machine without the employment of a Referring to the drawings, Figure l is a side elevation of an engine embodying the invention. Fig. 2 is a central vertical longitudinal section through the high-pressure and expansive cylinders. Fig. 3 is a detached sectional view of one corner of the high-pressure cylinder, illustrating the first position of the the engine, and Fig..5 is a top view of the high-pressure cylinder of same.

Referring to the drawings, A denotes the initial or high-pressure cylinder; B, the expansive cylinder; C, the piston-rod passing centrally throughsaid cylinders, and hav-ing D, and in the cylinder B the piston E.

The steam-pipe is designated by F. It contains a valve, G, and connects with the .pipe H, extending from the upper front portion to the lower rear portion of the high-pressure cylinder, as shown. The lower end of the pipe H leads to a valvefchamber, I, containing the valve J, and the upper end of said pipe leads to a similar valve-chamber, K, containing a valve, L, both chambers being cast with the cylinders.

From the valve-chamber I a port, M. leads to the back end of the cylinder A, and from said. chamber also extends the passageA N into into the front end of the cylinder A or into the passage O.leading along the upper side of the cylinder B, in the front end thereof.

The two lower'ends of the cylinder B con tain steam-chambers (letteredlPQ,respective ly) having valves It S, and being connected by a passage, T, leading to the exhaust V. At all times during the operation of the engine when the chamber Q opens into the passage T the chamber P willbe shut off therefrom.

end of the cylinder B by means of a port, W,

end of said cylinder by means of the port X, as indicated in Fig. 2. The exhaust V from the expansive cylinder B leads into the receiver Y, and thence into 'the chamber Z, whence it passes into the low-pressure cylinder a.

inlet-valve; and Fig. 4 is a front end viewy of secured upon it in the cylinder A the piston- The chamber P is connected with the back and the chamber Q is connected with the front the back end ofthe cylinder B. By means of So y the valve L the chamber K may be opened IOO The rods `b afford a means whereby the engine may be conveniently bolted to a duplex pump, if desired.

rIhe valves J L will be operated by the wellknown Corliss gear, (designated by d d,`)and the valves It S will beoperated by the plate e. rodsf,and arms g,constituting the well-known wrist motion. The Corliss geard and the devices used in connection therewith to actuate the valves R S,as well as the low-pressure cylinder, the receiver Y, steam-chamber Z, and connecting devices are all of well-known construction in steam-engines, and are not sought to be claimed in the present application. They are illustrated, however, in connection with the cylinders A B for the purpose of conveying an accurate idea of the invention when embodied in a compound direct-acting engine.

The elements specified as old being thoroughly understood,'it will be unnecessary to describe' them, except to point out their general functions when employed in connection with the, invention which is the subject of this applica.- tion, and which is illustrated in Fig.,2.

When in the operation ofthe engine the pis` tons D E are to commence their stroke, thevalve J will be in the position illustrated in Fig. 3, and steam will pass from the cham' ber I through the port IM into tl.e back end' of the cylinder A, and will` move the pistony toward the front end of the cylinder. Aflter the piston has n^ade about one-third of its stroke the valve J will be. moved to the` position 'shown in Fig. 2, thereby cutting 01T the steam in the chamber I and opening the passage N, the eifect being that a por-V tion of the steam already in the cylinder A will pass into the back end of the cylinder B, where it will expand 4against the piston E, and, in connection with the pressure in the' back end ofthe cylinder A,will move the pis-V tons with unvarying force to the front end of their respective cylinders. After the pistons D E have completed their stroke toward the front end of the cylindersA B the valve Lwill turn so as to open the passage m, when steam` from the chamber K will pass into the cylinder A at the front side of the piston, and will move theV latter about one-third of its back stroke, at which time the valve L will turn to the position illustrated in Fig. 2, cutting off the steam in the chamberv K, and permitting a portion of the steam in the cylinder A to flow through the passage O to the frontend of the cylinder B,where it will expand and move the pistons to the completion of their backstroke, in the manner before describedwhenl referring to the forward stroke ofthe pistons. When the pistons are upon their forward stroke, the valves R S are in the position illustrated in Fig. 2, the valve R preventing the expandingsteam from entering the exhaust V, while the steam on the front side of the piston Eis allowed to exhaust into the chamber V.

It will be observed that the steam is cut off from the high-pressure cylinder when the piston therein has made about one-third of the stroke, and that a portion of the steam in the high-pressure cylinder is then allowed to expand against a piston of increased area in the expansive cylinder, whereby the stroke of the piston4 is completed with unvarying regularity and force, the expansion of the steam against anincreased area at the point of cut-off counteractiug the decreased pressure in the initial cylinder.

The invention is applicable to single directacting engines as well as to compound and crank engines.

The invention not only obviates the necessity of using a fly-wheel, but also of employing large cylinders, thussaving expense in the construction of the engine, as well as reducing l vthe consumption of fuel.

What I claim as my invention, and desirev to secure by Letters Patent, is

1. The combination, with a high and low pressure cylinder, of connected pistons working therein, and valves for simultaneously cutting off the live steam after the pistons have completed a portion of ltheir stroke and admitting steam from? the high into the low pressure cylinder to complete the stroke, substantially as set forth. l l

2. In a'steam-engine, the high-pressure cylinder and expansive cylinder having connected pistons, the one in the latter cylinder having a larger area than that in the former, and valves for'cutting-o the steam after the pistons have'made a portion of their stroke and allowing a part of th'e steam then in the highpressure cylinder to expand'against the increased area 'of the piston in the expansife cylinder to complete the stroke, substantially in the manner and for the purposes described.

3.` In a steam-engine, the high-pressure cylinder containing a piston and supplied with chambers Iv K, valves .J. L, ports m M, and passage N, combined with the expansive cylinder containing a piston on the same rod with the piston in the high-pressure cylinder, and being provided with a passage, O, valves R S, and ports W X, substantiallyas and for the purposes described.

Signed at New York, in thecounty of New York, and State of New York, this 7th. day of November, A. D. 1884.

JOHN A. GROSHON. Witnesses:

' CHAs. G. GILL,

FRED E. MURPHY.

ICO 

